fix: allow claims without appointment + support post/core multi-tooth input

- Make appointmentId nullable/optional in Prisma Zod schema via @zod rich
  comment so claims can be submitted without an existing appointment
- Convert undefined appointmentId to null in all claim form handlers and
  the backend claim creation endpoint
- Add AI classifier rule for expanding one procedure across multiple
  comma-separated tooth numbers (e.g. "post/core on #23, 24, 25, 26")
- Add "post/core" (slash) alias to CDT lookup maps

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/db/shared/schemas/results/ServiceLineDeleteResult.schema.js

@@ -45,6 +45,9 @@ exports.ServiceLineDeleteResultSchema = z.nullable(z.object({
     arch: z.string().optional(),
     toothNumber: z.string().optional(),
     toothSurface: z.string().optional(),
+    icn: z.string().optional(),
+    paidCode: z.string().optional(),
+    allowedAmount: z.number().optional(),
     totalBilled: z.number(),
     totalPaid: z.number(),
     totalAdjusted: z.number(),